Red Hat Bugzilla – Bug 175824
Link monitor not documented for RHEL3
Last modified: 2015-04-19 20:46:59 EDT
Description of problem:
Although Link Monitor was added to Red Hat Cluster Suite 3, information about
enabling it is not available. Information about setting Link Monitor should be
The feature monitors the link status of the Ethernet device to which the
relevant IP address is assigned and will return a status failure if the MII does
not report that there is a link detected.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
The following questions were asked during discovery of this bug and may need to
be documented also:
1. Is monitor links function related to only
2. What is relevant IP address? Dose it mean only service IP, right?
3. When does this monitor links function work? Does it detect link down
all the time? Or does it only work when any service is started ?
Originally, it looked like the problem could be resolved with text shown in
"Description of Problem"; however, additional questions arose. Refer to
Reassigned to Lon Hohberger. Need resolution of questions listed in "Additional
info" that originally appeared in cluster-list thread.
Lon, when the questions are reconciled, please reassign back to me. Thanks.
(1) Monitor links only corresponds to links on devices where cluster service IP
addresses reside. All other system links are ignored.
(2) 'Monitor link' is a per-service-IP-address attribute, and only monitors the
link for the given service IP address.
(3) This checks on start and every time a service check ("status") run occurs.
Service checks only occur if you have a service check interval defined. If your
service check interval is 0, no link status monitoring occurs except at service
[3.b] If multiple service IP addresses are assigned to the same network device,
the link will be checked each service IP assigned to that network device which
has the 'monitor link' option set.
Updated draft and submitted for technical review. Lon, when review is complete,
please assign back to me. Thanks.
The update you sent me on 1/5 looks wonderful.
Thanks. When I post the change, I'll close this out.
Changes checked in to CVS. Requested push to redhat.com docs page.
Changed documentation is now available under the heading of "Red Hat Cluster
Suite 3" on redhat.com/docs:
Adding firstname.lastname@example.org for wider coverage
Removing automation notification
Closed. As noteded earlier, updated content is available here:
More specifically, updated content is here: